Punch



P. O. UNGER Aug. 14, 1945.

PUNCH 3 Shets-Sheet 2 INVENTOR PMQU @7 Filed Dec. 23, 1943 Aug. 14, 1945.v

P. O. UNGER PUNCH Filed Dec. 23, 1943 3 Sheets-Sheet 3 INVENTOR. y

Patented Aug. 14, 1945 Paul 0. Unger, Elmhurs Jones Company, Massachusetts t, 111., assignor to Wilson- Chicago, Ill., a corporation of Application December 23, 1943, Serial No. 515,35

1 Claim.

'I'hsi invention relates to a punch for perforating loose sheets of paper or similar material.

It is an object of this invention to provide a punch with means for applying increased power to the cutting punches. Other objects of this invention will become'apparent upon reading the following description, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a front elevation of a punch embodying my invention, with parts broken 'away to facilitate illustration of the structure;

Figure 2 is a longitudinal sectional view taken along the line IIII of Figure 1; t

Figure 3 is a cross sectional view taken along the line III-III of Figure 1;

Figure 4 is a cross sectional view, similar to Figure 3, showing the punch parts in depressed condition; and

Figure 5 is a detailed punch head.

In the drawings, the reference numeral 2 indicates a base member. The base member is provided with a laterally extending cutout portion 3. This cut out portion is provided with an enlarged portion 5 for a purpose hereinafter described. The base member is also provided with a pair of transversely extending apertures 5 parallel to the aperture 3. The apertures 5 constitute receptacles for the chips punched out of the sheets perforated by the punch and are each provided with a sliding bottom closure member 6. Although a pair of separated apertures 5 is shown, it will be understood that one long aperture may be substituted for the two shorter apertures. In this event a single closure member would replace the pair of closure members 6.

A plurality oi punch heads 1 is positioned on the base member 2. A scale 8 is provided on the top surface of the base member 2 adjacent the punch heads to facilitate lateral adjustment of the punch heads. The punch heads are each provided with a center line 9 to facilitate the proper positioning of the punch heads relative to perspective view of the the scale 8.

Each punch head comprises a base plate M, a spacer ll positioned on said base plate, and a frame l2. The frame is formed from a continuous strip of sheet metal having one portion l3 which constitutes a stripper plate positioned on said spacer II and extending over the base plate l where it projects beyond the spacer H to provide a throat l4 between the base plate l0 and the stripper plate Hi. The front edge l of the spacer ll constitutes the back of the throat l4.

The strip of sheet metal forming the frame I! i 55 bent upwardly to provide a front wall l6 and 'is then bent at right angles to provide a top wall I! for the punch heads. The strip is then bent downwardly, as indicated at It to form avtail portion l9 which engages the rear portion of the stripper plate l3. The base plate ID, the spacer H, the rear portion of the stripper plate l3, and the portion l9 are all welded together to form a rigidstructure.

The stripper plate l3 and the top wall I! are provided with registering apertures 20 and 2| which are adapted to receive a punch pin 22. A flange 23 is secured to the punch pin 22 adjacent the under surface of the top wall I l. A coiled spring 24 encircles the punch pin 22 below the flange 23 and is operable to force the punch pin upwardly upon release of the handle after the punch pin has been depressed. The base plate I0 is provided with an aperture 25 in registration with the apertures 2i) and 2| to receive the cutting end of the punch pin 22 when it is depressed, as indicated in Figure 4. sitioned directly over the chip receptacle 5.

The rear portion of punch head 1 is provided with a threaded aperture 26 which is positioned directly over the aperture 3 when the punch head is positioned on the base member 2. A screw 21' having an enlarged head fitting in the wide portion 4 of the aperture 3 is adapted to engage the screw threaded aperture 26 to maintain the punch head in any desired lateral position on the base member. When the screw 21 is tightened, the punch head I is positioned in a slight depression 29 formed in the top surface of the base member 2.. This depression 29 extends transversely across the entire width of the punch and is of the same depth as the thickness of the base plate l0 so that the top surface of the base plate Ill is flush with the top surface of the base member 2- to facilitate the insertion of sheets into the punch. When it is desired to remove any punch head I from the base member the screw 21 is disengaged from the aperture 26, and the punch head may then be lifted off the base member.

A pair of upstanding supports 30 is secured to the opposite ends of the base member 2 adjacent the rear edge thereof. One of said supports 30 is provided with an aperture 3| and a conventional wire side gauge 32 has one leg secured in said aperture 3| by means of a thumb screw 33. An operating handle 34 is pivotally mounted on a rod 35 which has its opposite ends mounted in the supports 30. The handle is mounted on the rod by means of a plurality of straps 36 in the The aperture 25 ispothe base plate Ill and the stripper plate embodiment shown in the drawings, but any suitable means for mounting the handle on the rod 35 might be used. The handle 34 is provided with a hand hole 31 to facilitate the manipulation of the handle.

A rod 38, similar to the rod 3|, also has its opposite ends mounted in the upstanding supports 80, and has a pressure plate I9 pivotally mounted thereon by' means of a plurality of straps 4|. The rear edge of the pressure plate 89 is operatively connected to the rear edge of the operating handle 34 by means of a plurality of links ll. A rod 42 projecting through the handle 34 engages one end of each of said links 4|, and a rod ll, secured to the pressure plate 39 by means 01 a plurality of straps 44, engages theopposite end of each link ll. A metal plate 45 is secured to the edge of the pressure plate 39 where the pressure plate is in engagement with the top of the punch pin 22.

The operation of the punch will be clear from a study of Figures 3 and 4 of the drawings. When the punch Figure 3, a sheet or be inserted into the throat sheets to be perforated may ll formed between It or the punch heads. Downward pressure on the operating handle ll lifts the links ll, and with them the rear edge of the pressure plate 39. The force applied to the top of the punch pins 22 is increased by the compound leverage between the is in the position indicated in vrile and the pressure operating handle SI and the pressure plate I! so that the punch pins may perforate a greater number of sheets in a single operation than wound be possible if the handle pressed directly against the punch pins.

Although I have described a preferred embodiment or my invention in detail, it will be understood that the description thereof is illustrative,

rather than restrictive, as many details may be modified or changed without departing from the.

spirit or scope of my invention For example, the embodiment illustrates a punch constructed substantially or wooden parts, and it will be obvious that when the parts are made of metal the finished appearance oi the punch would be improved it the various rods pass through the hanplate instead of being secured on the outside thereof. Accordingly, I do not desire to be restricted to the-exact construction described, except as limited by the appended claim.

I claim:

In a desk type hand operated punch, a base member, a pair 0! upstanding supports secured to opposite ends oi'said base me'mber, a pair oi rods each having its ends mounted in said sup ports, a pressure plate pivotally secured to one 0 said rods, an operating handle pivotally secure( to said other red, and a link connecting said operating handle to said pressure plate.

PAUL O. UNGER. 

